{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2026-18508 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-18508 is a medium-severity path traversal vulnerability in Redhat Enterprise Linux, published on 3 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-18508 and fix it if it is affected.\n\nWhat it is: CVE-2026-18508 is a medium-severity path traversal vulnerability in Redhat Enterprise Linux, published on 3 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-18508 in the wild and no public exploit code.\n\nAffected product: Redhat Enterprise Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-18508/ (Markdown: https://insights.sbomify.com/CVE-2026-18508/index.md)","id":"CVE-2026-18508","markdown":"https://insights.sbomify.com/CVE-2026-18508/index.md","name":"CVE-2026-18508","record":{"aliases":["AZL-94599","CLSA-2026-1789128477","CLSA-2026-1789131413","DEBIAN-CVE-2026-18508","ECHO-94ec-2dbe-8b73","GHSA-4f5j-wqjr-hx49","OESA-2026-3911","OESA-2026-3912","OESA-2026-4081","RHSA-2026:50807","UBUNTU-CVE-2026-18508"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["data_modify"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"GNU tar utility","requires_auth":"none","summary":"Attackers can overwrite arbitrary files outside the extraction directory by crafting archives with hardlinks when using the --one-top-level option.","user_interaction":"required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"tar","vendor":"gnu"},{"product":"enterprise_linux","vendor":"redhat"},{"product":"openshift_container_platform","vendor":"redhat"}],"cvss":{"score":4.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-59","name":"Improper Link Resolution Before File Access"}],"description":"A flaw was found in GNU tar. When extracting an archive with the --one-top-level option, hardlink targets are not confined to the designated top-level directory and may resolve relative to the extraction working directory. A crafted archive can create hardlinks that escape the intended boundary and, when combined with a preexisting symbolic link under the working directory, may allow writing outside that boundary during a single extraction.","ecosystems":["Red Hat:hummingbird:1"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite","id":"CVE-2026-18508","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"redhat:enterprise_linux","products":["redhat:enterprise_linux","redhat:openshift_container_platform"],"type":"path_traversal","year":"2026"},"n_packages":1,"n_references":8,"next":{"headline":"IBM i is Affected By A Prvilege Escalation Vulnerability []","id":"CVE-2026-18509"},"packages":[{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:1.35-9.2.hum1"],"introduced":["0"],"last_affected":[],"package":"tar","purl":"pkg:rpm/redhat/tar","source":"RHSA-2026:50807"}],"prev":{"headline":"IBM Financial Transaction Manager (FTM) is Impacted by Multiple Vulnerabilities","id":"CVE-2026-18505"},"products":["Red Hat Discovery 2","Red Hat Enterprise Linux 10","Red Hat Enterprise Linux 6","Red Hat Enterprise Linux 7","Red Hat Enterprise Linux 8","Red Hat Enterprise Linux 9","Red Hat Hardened Images","Red Hat OpenShift Container Platform 4","Red Hat Update Infrastructure 5"],"published":"2026-08-03","related":[{"cvss_score":10,"headline":"Privilege escalation in n/a","id":"CVE-2005-2541","kev_date_added":null,"published":"2005-08-10"},{"cvss_score":7.5,"headline":"Null dereference in n/a","id":"CVE-2019-9923","kev_date_added":null,"published":"2019-03-22"},{"cvss_score":7.5,"headline":"Path traversal in n/a","id":"CVE-2016-6321","kev_date_added":null,"published":"2016-12-09"},{"cvss_score":6.8,"headline":"Path traversal in n/a","id":"CVE-2007-4131","kev_date_added":null,"published":"2007-08-25"},{"cvss_score":6.2,"headline":"Denial of service in n/a","id":"CVE-2023-39804","kev_date_added":null,"published":"2024-03-27"},{"cvss_score":5.1,"headline":"Memory corruption in n/a","id":"CVE-2006-0300","kev_date_added":null,"published":"2006-02-24"},{"cvss_score":5,"headline":"Tar: tar: hidden file injection via crafted archives","id":"CVE-2026-5704","kev_date_added":null,"published":"2026-04-06"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-22","vendors":["Red Hat"]},"summary":"Attackers can overwrite arbitrary files outside the extraction directory by crafting archives with hardlinks when using the --one-top-level option.","url":"https://insights.sbomify.com/CVE-2026-18508/"}